/*  
  -- The Lime II Project -- 

  A tuplespaces-based middleware for coordinating agents and mobile hosts.
  Copyright (C) 2005.
  Gian Pietro Picco, Amy L. Murphy, Lorenzo Bellini.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received this copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
*/

package lime2.ca.localtest;
import lime2.ca.EngMsg;
import lime2.*;
import java.io.*;
import java.net.*;

/**
 * A "receiver" of remote messages. It listens "on" a UDP socket, receives remote ops and enqueues them. It differs 
 * from <code>LocalReceiver</code> only wrt the way it discards the own looped-back datagrams (.. here multicasting is
 * only simulated). 
 * 
 * @author Gian Pietro Picco
 * @author Amy Murphy
 * @author Lorenzo Bellini 
 */

class LocalTestReceiver extends Thread
{
 // private data members	
 private DatagramSocket dsock;
 private boolean shutdown;
  
 /**
  * Constructor method.
  * 
  * @param dsock datagram socket to use for listening
  */
 LocalTestReceiver(DatagramSocket dsock)
 {
  super();	
  this.dsock = dsock;
  this.shutdown = false;
 }
 	
 /**
  * Run method. 
  */
 public void run()
 {
  // initializes receiving buffer
  byte[] buffer = new byte[LimeConstants.UDP_BUFFER_SIZE]; 	
  
  // loop
  while (!shutdown) 
  {
   try 
   {	
    DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
    dsock.receive(dp);
    if (dp.getPort() != dsock.getLocalPort()) 
    // discards its own looped-back datagrams (.. we just need to check port)
    {
     Object o = Serializer.deserialize(dp.getData());
     if (o instanceof EngMsg) LocalTestCA.ltd.collectMsg((EngMsg) o); else LocalTestCA.queue.add(o); 	
    }	
   }
   catch (IOException ioe) { ioe.printStackTrace(); } // just prints stack trace: "robust" server 
  }
  // end loop
  dsock.close();
  dsock = null; //.. from now on trying to send a message will result in a TOTAL failure 
 }

 /**
  * Shuts the receiver down.
  */
 void shutdown()
 {
  shutdown = true;	
 } 
 
} 

